The Signature of Tidal Disruption Phenomena in the Vicinity of a Black Hole

M. CALVANI and C. GERMANAINAF - Astronomical Observatory of PadovaVicolo Osservatorio 5, 35122 Padova, ItalyTidal e ects on clumps of material during random non-stationary accretion onto a blackhole produce phenomena with distinct temporal characteristics in observed light-curves.During such non-stationary accretion events, the shape of the accreting object evolves intime, and observable quasi-periodic phenomena with variable quasi-periods are produced.A number of characteristic light-curves, obtained with numerical simulations, will beshown. Their relevance to observed phenomena will be briey discussed.Keywords: Galaxy: nucleus; galaxies: active; black hole physics.